Lord of the Rings gave such a backstory exposition at the very beginning, and nobody complained about being "confused" by so much backstory.
No but plenty of LOTR fans complained that it wasn't the "prime" timeline.
And again, you wound up with fans who wanted an exact, word-for-word duplication of the novels and fans who wanted an extreme, radical reinterpretation like John Boorman's failed LoTR
movie pitch because both sides felt Jackson's moderate changes and edits were insulting to the material. Some even threw their support behind Ralph Bakshi's animated version, which kept the book's dialogue verbatim but chopped the story into incomprehensibility.
Listening to fans' desires in any case is a recipe for disaster.